body{
	width:90%;
	max-width:800px;
	margin:auto;
}
@media screen and (min-width:640px){
	body{
		background-color: #eaf6ff
	}
	h1{
		font-size:2.5rem;
	}
} 
@media screen and (max-width:500px){
	h1{
		font-size:1.5rem;
	}
}
ul{
	list-style-type:none;
	margin:0;
	padding:0;
}
#fixed-size-grid-items aside{
	width:170px
	margin:10px;
	font-size:0.8rem;
}
.column{
 width:25%;
 display:inline-block;
 vertical-align: top
}
#stretchable-grid-items li {
	width:100%;
	display:inline-block;
	vertical-align:top;
}
@media screen and (min-width:480px) and (max-width: 640px){
	#stretchable-grid-items li{
		width:50%;
		display:inline-block;
	}
}
@media screen and (min-width:640px){
	#stretchable-grid-items li{
		width:25%;
		display:inline-block;
	}
}
#stretchable-grid-items aside{
	margin:10%;
}
#stretchable-grid-items ul{
	margin-left:-10px;
	margin-right:-10px;
	margin-top:1rem; 
	margin-bottom: 1rem;
}